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If you've checked all of those areas and were unable to find the code, then you're probably stuck with visiting your favorite repair shop, dealership, or locksmith and having them retrieve the 5-digit code via their scan tool. Oh, also check the owner's manual (if you have it) to see if there's either a credit card sized card with the code or maybe someone hand-wrote the code on one of the pages of the manual about how to use or set the code.